CN106363132A

CN106363132A - Lost-foam casting device

Info

Publication number: CN106363132A
Application number: CN201611016264.1A
Authority: CN
Inventors: 张海学
Original assignee: SUIYANG HAIHONG FOUNDRY CO Ltd
Current assignee: Peixian Dongfang Casting Co., Ltd
Priority date: 2016-11-18
Filing date: 2016-11-18
Publication date: 2017-02-01
Anticipated expiration: 2036-11-18
Also published as: CN106363132B

Abstract

The invention discloses a lost-foam casting device which comprises a box body and a foam model, wherein molding sand is arranged in the box body; the foam model is arranged inside the molding sand; the foam model comprises a body and a rope groove; the box body is further equipped with a flexible packing layer matched with the rope groove; a plurality of groups of expanding blocks which are pre-heated to expand are arranged in the molding sand; each group of expanding blocks is opposite to the filling layer; and a supporting rod is arranged between each group of expanding blocks and the box body. According to the scheme adopted by the invention, the lost-foam casting device mainly solves the problem that the rate of reaching the standards of cast pieces is low due to the fact that fit degree between the molding sand the foam model is not high.

Description

A kind of casting device of evaporative pattern

Technical field

The invention belongs to casting and molding field is and in particular to a kind of molding sand for mould casting or similar casting mold.

Background technology

Lost foam casting be foam mould adopt bindless dry sand combine vacuum pumping technology cavityless casting, be by with The similar bubbles model bonding of casting dimension shape is combined into model cluster, after brushing fireproof coating and drying, is embedded in molding sand and shakes Dynamic moulding, pours into a mould under negative pressure, so that model is gasified, and liquid metals occupies modal position, forms the new of foundry goods after solidification cooling Casting method.

At present, the foundry goods compliance rate produced is relatively low, and it main reason is that in foundry goods manufacture process, molding sand and foam mold The laminating degree of type is not high, particularly to the bending section of foundry goods, groove portion and hole portion.In the production process to elevator rope pulley, elevator Bubbles model (the including body and grooving) vibration molding in molding sand of rope sheave, the neighbouring sand compaction of grooving of bubbles model is not Enough, lead to moulding in molding sand for the bubbles model imperfect, therefore reduce reaching of the elevator rope pulley that liquid metals cast is obtained Mark rate.

Content of the invention

The invention is intended to providing a kind of casting device of evaporative pattern, to solve because of the degree of packing between molding sand and bubbles model Not lead to the low problem of foundry goods compliance rate.

In order to achieve the above object, the base case of the present invention is as follows: a kind of casting device of evaporative pattern, including casing and Bubbles model, is provided with molding sand in described casing, and described bubbles model is inside molding sand, and bubbles model includes body and rope Groove, described casing is additionally provided with the packed layer of the flexibility matching with grooving, is provided with the swollen of some groups of pre- thermal expansions in described molding sand Expansion block, described in every group, expanding block is all oppositely arranged with packed layer, and every group is provided with support bar between expanding block and casing.

The principle of base case: during operation, fill up casing initially with molding sand, and molding sand covers packed layer, then by elevator The bubbles model of rope sheave is put in molding sand it is ensured that packed layer and molding sand embed in grooving, in addition, being also placed with some in molding sand Group expanding block, and ensure that every group of expanding block is oppositely arranged with packed layer；Then under negative pressure cast liquid metals so that foam mold Type gasifies, and the heat of liquid metals makes the pre- thermal expansion of expanding block, under the supporting role of support bar, swollen under this state Expansion block extrudes to packed layer, due to packed layer be flexible so that packed layer extrude tight between layer of sand and bubbles model Solidity is higher；Final liquid metal occupies modal position, forms foundry goods after solidification cooling.

The advantage of base case: compared to current foundry goods manufacture device, this programme is met using flexible packed layer cooperation The expanding block extruding layer of sand of thermal expansion makes the degree of packing between layer of sand and the grooving of bubbles model higher, and then ensure that foam The integrity of model moulding in molding sand, improves the compliance rate of elevator rope pulley.

Preferred version one: based on scheme preferred version, described packed layer includes layer of sand and rubber from the inside to the outside successively Poly-bag, described rubber bag fills up molding sand, and by above-mentioned setting, one entirety of molding sand filled rubber bag formation is used for extruding layer of sand, Layer of sand fills grooving, improves the degree of packing between molding sand and the grooving of bubbles model；In addition, the molding sand of rubber bag can repeatedly make With escapable cost.

Preferred version two: preferably one preferred version, described rubber bag is provided with opening, and described opening sets There is the closure being detachably connected, by above-mentioned setting, the closure on opening opens and closes, be easy to the filling of molding sand and close Envelope, simple to operate.

Preferred version three: preferably two preferred version, expanding block described in every group is triangular in shape, is set by above-mentioned Put, according to the stability of triangle, every group of expanding block is more stable to the extruding of packed layer, improves the compliance rate of mould casting.

Preferred version four: preferably three preferred version, the side wall of described casing is provided with link, by above-mentioned Setting, the hook of available loop wheel machine is connected with link, realizes mechanization transportation, reduces manual labor.

Brief description

Fig. 1 is a kind of structural representation of the casting device embodiment of evaporative pattern of the present invention；

Fig. 2 is the structural representation of grooving.

Specific embodiment

Below by specific embodiment, the present invention is further detailed explanation:

Reference in Figure of description includes: casing 1, molding sand 2, body 3, grooving 4, rubber bag 5, expanding block 6, link 7.

Embodiment is substantially as shown in accompanying drawing 1, Fig. 2: a kind of casting device of evaporative pattern, including casing 1, molding sand 2 and elevator Sheave-like bubbles model, trunkful body 1 filled by molding sand 2, and bubbles model is positioned over inside molding sand 2, and bubbles model includes body 3 With grooving 4, casing 1 is connected with, by iron chains, the packed layer matching with grooving 4, packed layer includes layer of sand from the inside to the outside successively With rubber bag 5, rubber bag 5 fills up molding sand, and molding sand 2 filled rubber bag 5 forms an entirety and is used for extruding layer of sand, layer of sand gasket for packing Groove 4, improves the degree of packing between molding sand 2 and the grooving 4 of bubbles model；In addition, the molding sand of rubber bag 5 can be used for multiple times, can save Cost-saving.

It is provided with the expanding block 6 of some groups of pre- thermal expansions in molding sand 2, and be connected with support between every group of expanding block 6 and casing 1 Bar, every group of expanding block 6 is all oppositely arranged with packed layer, and every group of expanding block 6 is triangular in shape, according to the stability of triangle, often Group expanding block 6 is more stable to the extruding of packed layer, improves the compliance rate of mould casting.

Additionally, offering opening in rubber bag 5, seal with screwed joint lid on opening, the closure on opening is opened and is closed Close, be easy to filling and the sealing of molding sand 2.Link 7 is connected with the side wall of casing 1, the hook of available loop wheel machine is with link 7 even Connect, realize mechanization transportation, reduce manual labor.

In the present embodiment, during operation, fill up casing 1 initially with molding sand 2, rubber bag 5 filled by molding sand 2, and molding sand 2 covers Rubber bag 5, then the bubbles model of elevator rope pulley is put into it is ensured that rubber bag 5 and molding sand 2 embed in grooving 4 in molding sand 2, in addition, Also it is placed with some groups of expanding blocks 6 in molding sand 2, and ensure that every group of expanding block 6 and rubber bag 5 are oppositely arranged；Then in negative pressure Lower cast liquid metals is so that bubbles model gasifies, and the heat of liquid metals makes the pre- thermal expansion of expanding block 6, is supporting Under the supporting role of bar, the expanding block 6 under this state extrudes to rubber bag 5, and due to rubber bag 5 filling is molding sand 2, makes The degree of packing obtaining between rubber bag 5 extruding layer of sand and the grooving 4 of bubbles model is higher；Final liquid metal occupies modal position, Form foundry goods after solidification cooling.

Above-described is only embodiments of the invention, the general knowledge here such as known concrete structure and/or characteristic in scheme Excessively describe.It should be pointed out that for a person skilled in the art, on the premise of without departing from present configuration, also Some deformation can be made and improve, these also should be considered as protection scope of the present invention, these are real all without the impact present invention The effect applied and practical applicability.This application claims protection domain should be defined by the content of its claim, description In specific embodiment etc. record the content that can be used for explaining claim.

Claims

1. a kind of casting device of evaporative pattern, including casing and bubbles model, is provided with molding sand in described casing, described bubbles model Inside molding sand, and bubbles model include body and grooving it is characterised in that: described casing is additionally provided with and is matched with grooving Flexible packed layer, is provided with the expanding block of some groups of pre- thermal expansions in described molding sand, expanding block described in every group all with packed layer phase To setting, and every group is provided with support bar between expanding block and casing.

2. evaporative pattern according to claim 1 casting device it is characterised in that: described packed layer wraps from the inside to the outside successively Include layer of sand and rubber bag, described rubber bag fills up molding sand.

3. evaporative pattern according to claim 2 casting device it is characterised in that: described rubber bag is provided with opening, institute State opening and be provided with the closure being detachably connected.

4. evaporative pattern according to claim 3 casting device it is characterised in that: expanding block described in every group is triangular in shape, And every group be provided with support bar between expanding block and casing.

5. evaporative pattern according to claim 4 casting device it is characterised in that: the side wall of described casing is provided with extension Ring.